PSN-L Email List Message

Subject: New WinQuake Beta Release
From: "Larry Cochrane" cochrane@..............
Date: Sun, 26 Jan 2003 03:19:51 -0800

Hi Everyone,

I've released a new beta version of WinQuake, see this page for a download
link and release notes:

Here's what's new in this release. For a complete list of new features and
how to use them please see the release notes.

Both WinQuake and WinSDR (the current beta version just released) now
support a new data structure in the PSN Type 4 event file record. The new
structure contains additional information about the sensor channel. The new
data fields are: Sensor output voltage in volts per cm of movement,
amplifier gain between the sensor and the A/D converter and the peak A/D
input volts. This information and the number of A/D bits make up the Sensor
Sensitivity field in the main fix header section. See this page for more
information on the PSN Type 4 event file format:

WinQuake now calculates Mb or Body Wave magnitude. The program uses this
formulate to calculate Mb:
mb = log10(A/T) + 0.01*D + 5.9  A = Peak P wave displacement amplitude in
micrometers, T = Period of the displacement amplitude and D = Distance in
degrees. The program can also calculate the Ms or Mb peak wave period used
by the Ms and Mb formulas.

In the Time Domain Filter dialog box the user can now enter the period in
seconds rather then the frequency. To do this add an 's' after the number.
Example: Entering "20s" will produce a frequency of 0.05 Hz.

The user can now crop an event file. To do this zoom into the area of
interest and then use the View / Crop menu items.

The user can now search for event files on their system. The search includes
filters like min/max magnitude, event to station distance, start and end
times, as well as other filters. To make the search faster, the program can
create a database file. This file contains information about each event file
in a directory and any subdirectories. The database file can be used for the
search rather then opening each file on your system. This drastically
improves the search time if you have a lot of event files.

WinQuake now as a Magnitude Calculator dialog box. See the release notes for
all of the info on this new dialog box.

The Y-Scaling has been changed. The Y-Scale number now represents the peak
data to display. Example: If WinQuake is displaying A/D counts and the
Y-Scale number is set to 1000, WinQuake will display 0 to +-1000 counts. The
program can display the following Y-Scale units: A/D Counts, this is the
default if the Sensor Sensitivity number and A/D Input Volts fields of the
header are 0, Sensor Units (cm, mm etc) if the Sensor Sensitivity is known,
amplifier input voltage, this is the voltage from the sensor element, if the
amp gain and A/D input voltage is known, and A/D volts if this information
is available in the header.

The map window's title now displays the Y-Scale in the title bar of the map
window. This is the distance in km displayed between the top and bottom of
the window.

That's it for the new features. I'm currently working on a major rewrite of
the program so that more then one event file can be displayed in the same
event window. The ability to add new event files to the same window will be
limited to Z, N-S and E-W channels with the same start / end times and
sample rate. This way the data from a two or three component sensor can be
displayed and analyzed in one window. I also will be adding the ability to
read and write a PSN volume set that can contain two or three event files.
Once I have this working and released, I will modify WinSDR so it can
support a two or three channel volume set file that can be read in with

Larry Cochrane
Redwood City, PSN


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